Standard Deviation Calculator
Find the mean, square each value's distance from that mean, average those squared distances, and take the square root. This tool reports population standard deviation.
This calculator is free to use. Enable JavaScript to enter your values and see a result instantly.
How it works
Find the mean, square each value's distance from that mean, average those squared distances, and take the square root. This tool reports population standard deviation.
Worked example
For 2, 4, 4, 4, 5, 5, 7, 9, the population standard deviation is 2.
Keep in mind
Use sample standard deviation for a sample intended to estimate a larger population.